2022 ANDSS Chem Prelims P2

This document consists of 22 printed pages. Setter: Ms Sheena Cheong O ANDERSON SECONDARY SCHOOL Preliminary Examination 2022 Secondary Four Express CANDIDATE NAME: CLASS: / INDEX NUMBER: CHEMISTRY Paper 2 6092/02 18 Aug 2022 1 hour 45 minutes 0800 – 0945h Candidates answer in the Question Paper. No Additional Materials are required READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions in the spaces provided. Section B Answer all three questions, the last question is in the form of either/or. Answer all questions in the spaces provided. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 22. The use of an approved scientific calculator is expected, where appropriate. Section A Section B Total ______________________________________________________________________________

PRELIM 4E CHEM 2022 6092/02 2 Section A Answer all questions in this section in the spaces provided. The total mark for this section is 50. A1 (a) The diagrams can be used to represent the structures of organic compounds that produce a smell. A H3C — CH2 — CH = CH2 B H3C — CH2 — CH2 — CH2 — CH2 | O — H C H3C — CH2 — CH2 — CH2 — CH2 — CH2 | O — H D H3C — CH2 — CH2 — C = O | O — H E H3C — CH2 — CH2 — CH — CH3 | O — H F H3C — CH = CH — CH3 Use the letters A, B, C, D, E and F to answer the questions. Each letter may be used once, more than once or not at all. (i) Which compounds are isomers? ……………………………………………………………………………….. [1] (ii) Suggest one pair of compounds that undergoes a reaction to form an ester. ……………………………………………………………………………….. [1] (iii) Which compounds can decolourise aqueous bromine? ……………………………………………………………………………….. [1]

PRELIM 4E CHEM 2022 6092/02 3 (iv) Which compound can react with magnesium to produce a gas that extinguished a lighted splint with a ‘pop’ sound? ……………………………………………………………………………….. [1] (b) Crude oil produces a range of substances that have many uses. Which statements about the different fractions of crude oil are true and which are false? Put a tick (✔) in one box in each row. true false Petroleum is separated by different density into different fractions. Alkanes used in diesel fuel have lower boiling points